Abstract:

A quick-release structure for outer cover of a handheld circular saw,
including a main body, an outer cover, a circular saw blade disposed
between the main body and the outer cover, a motor disposed in the main
body for driving the circular saw blade and a first, a second, a third
and a fourth connection sections. The first and second connection
sections are respectively disposed at a first end and a second end of the
main body. The third connection section is disposed at a first end of the
outer cover corresponding to the first connection section for connecting
therewith. The fourth connection section is disposed at a second end of
the outer cover corresponding to the second connection section for
connecting therewith. The third connection section is angularly and
linearly displaceable relative to the outer cover and the first
connection section without detaching from the outer cover.

Claims:

1. A quick-release structure for outer cover of a handheld circular saw,
comprising a main body, an outer cover, a circular saw blade, a motor, a
first connection section, a second connection section, a third connection
section and a fourth connection section, wherein: the circular saw blade
is disposed between the main body and the outer cover; the motor is
disposed in the main body for driving the circular saw blade; the first
connection section is disposed at a first end of the main body; the
second connection section is disposed at a second end of the main body;
the third connection section is disposed at a first end of the outer
cover corresponding to the first connection section for connecting with
the first connection section; and the fourth connection section is
disposed at a second end of the outer cover corresponding to the second
connection section for connecting with the second connection section, the
quick-release structure being characterized in that the third connection
section is angularly and linearly displaceable relative to the outer
cover and the first connection section without detaching from the outer
cover, whereby the first connection section and the third connection
section are selected from the group consisting of engaging and
disengaging.

2. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 1, wherein the first connection section is a
column body fixedly disposed on the main body, the third connection
section including a first rod body, a second rod body and a resilient
member, the first rod body being fitted through a through hole formed on
the outer cover, a first end of the first rod body being positioned on
outer side of the outer cover and having a force application section, the
second rod body being positioned on inner side of the outer cover, a
first end of the second rod body having a cross-sectional area larger
than that of the through hole on the inner side of the outer cover, the
first end of the second rod body being connected with a second end of the
first rod body, a second end of the second rod body having a hook section
outward extending from the second end for hooking the column body, a
guide slope being formed on outer side of the hook section, the resilient
member being disposed between the outer cover and the first rod body,
whereby when the first rod body is rotated and the second rod body is
drivingly angularly displaced, the second rod body is also driven and
vertically displaced.

3. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 2, wherein the resilient member is a wave washer
and positioned between outer side of the outer cover and the first rod
body.

4. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 2, wherein outer periphery of the first end of
the first rod body is formed with a polygonal shape and the force
application section is a shift member, one end of the shift member being
formed with a through hole, inner periphery of the through hole having a
shape corresponding to that of the outer periphery of the first end of
the first rod body for connecting with the first rod body.

5. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 2, wherein the resilient member is a coiled
spring.

6. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 2, wherein the second connection section is a
waved plate body fixedly disposed on the main body, the fourth connection
section being a column body fixedly disposed on the outer cover for
engaging with the waved plate body.

7. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 3, wherein the second connection section is a
waved plate body fixedly disposed on the main body, the fourth connection
section being a column body fixedly disposed on the outer cover for
engaging with the waved plate body.

8. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 4, wherein the second connection section is a
waved plate body fixedly disposed on the main body, the fourth connection
section being a column body fixedly disposed on the outer cover for
engaging with the waved plate body.

9. The quick-release structure for outer cover of the handheld circular
saw as claimed in claim 5, wherein the second connection section is a
waved plate body fixedly disposed on the main body, the fourth connection
section being a column body fixedly disposed on the outer cover for
engaging with the waved plate body.

Description:

BACKGROUND OF THE INVENTION

[0001] The present invention relates generally to a quick-release
structure, and more particularly to a quick-release structure for outer
cover of a handheld circular saw.

[0002] A conventional handheld circular saw mainly includes a main body,
an outer cover, a circular saw blade and a motor. The circular saw blade
is disposed between the main body and the outer cover. The motor is
disposed in the main body for driving the circular saw blade. The outer
cover is assembled and locked with the main body generally by means of
one or two threaded rods. When it is necessary to maintain or service the
handheld circular saw, the threaded rods are detached with a tool so as
to separate the outer cover from the main body. However, in some cases, a
suitable tool for detaching the threaded rods can be hardly readily
found.

[0003] Furthermore, after detached, the threaded rods are separated from
the outer cover. In this case, the threaded rods are apt to roll away or
be covered by some other articles. Therefore, after the maintenance or
service of the handheld circular saw is completed, the threaded rods are
often hard to retrieve. Under such circumstance, a user may have to
operate the handheld circular saw without the outer cover. This is
extremely dangerous to the user.

SUMMARY OF THE INVENTION

[0004] It is therefore a primary object of the present invention to
provide a quick-release structure for outer cover of a handheld circular
saw, which enables a user to readily and conveniently disassemble and
assemble the outer cover of the handheld circular saw.

[0005] It is a further object of the present invention to provide the
above quick-release structure for outer cover of the handheld circular
saw, which can ensure safety in use of the handheld circular saw.

[0006] To achieve the above and other objects, the quick-release structure
for outer cover of the handheld circular saw of the present invention
includes a main body, an outer cover, a circular saw blade disposed
between the main body and the outer cover, a motor disposed in the main
body for driving the circular saw blade and a first, a second, a third
and a fourth connection sections. The first connection section is
disposed at a first end of the main body. The second connection section
is disposed at a second end of the main body. The third connection
section is disposed at a first end of the outer cover corresponding to
the first connection section for connecting with the same. The fourth
connection section is disposed at a second end of the outer cover
corresponding to the second connection section for connecting with the
same. The third connection section is angularly and linearly displaceable
relative to the outer cover and the first connection section without
detaching from the outer cover.

[0007] The present invention can be best understood through the following
description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a perspective assembled view of a first embodiment of the
present invention;

[0009]FIG. 2 is a perspective exploded view of the first embodiment of
the present invention, showing the main body, the outer cover, the first
connection section, the second connection section, the third connection
section and the fourth connection section thereof;

[0010]FIG. 3 is a sectional assembled view of the first embodiment of the
present invention, showing that the third connection section is assembled
with the outer cover corresponding to the first connection section;

[0011]FIG. 4 is a perspective exploded view of a second embodiment of the
present invention, showing the main body, the outer cover, the first
connection section, the second connection section, the third connection
section and the fourth connection section thereof; and

[0012]FIG. 5 is a sectional assembled view of the second embodiment of
the present invention, showing that the third connection section is
assembled with the outer cover corresponding to the first connection
section.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Please refer to FIGS. 1, 2 and 3. According to a first embodiment,
the quick-release structure for outer cover of the handheld circular saw
of the present invention includes a main body 12, an outer cover 13, a
first connection section 14, a second connection section 15, a third
connection section 16 and a fourth connection section 17.

[0014] A motor 22 is disposed in the main body 12 and connected to a
circular saw blade 24 for driving the same. The circular saw blade 24 is
disposed between the main body 12 and the outer cover 13.

[0015] The first connection section 14 is disposed at a first end of the
main body 12. The first connection section 14 can be a column body or a
cylindrical body. Two ends of the first connection section 14 are fixedly
connected to the main body 12.

[0016] The second connection section 15 is disposed at a second end of the
main body 12. The second connection section 15 can be a waved plate body.
One end of the second connection section 15 is fixedly connected to the
main body 12.

[0017] The third connection section 16 is disposed at a first end of the
outer cover 13 corresponding to the first connection section 14 for
connecting with the same.

[0018] The third connection section 16 includes a first rod body 62, a
second rod body 64 and a resilient member 66.

[0019] The first rod body 62 is fitted through a through hole 32 formed on
the outer cover 13. A first end of the first rod body 62 is positioned on
outer side of the outer cover 13 and has a force application section 621.
The outer periphery of the first end of the first rod body 62 is formed
with a polygonal shape such as hexagonal shape. The force application
section 621 is a shift member. One end of the shift member is formed with
a through hole 621'. The inner periphery of the through hole 621' has a
shape corresponding to that of the outer periphery of the first end of
the first rod body 621. Accordingly, the shift member can be engaged with
or connected with the first rod body 62 by means of a screw.
Alternatively, the first end of the first rod body 62 with the hexagonal
shape itself serves as the force application section 621. In this case,
the first rod body 62 can be wrenched with a tool such as a wrench.

[0020] The second rod body 64 is positioned on inner side of the outer
cover 13. A first end of the second rod body 64 has a cross-sectional
area larger than that of the through hole 32 on the inner side of the
outer cover 13. The first end of the second rod body 64 is formed with a
threaded hole 641 for connecting with an outer thread 622 of the second
end of the first rod body 62. The second end of the second rod body 64
has a hook section 642 outward extending from the second end for hooking
the column body or cylindrical body of the first connection section 14. A
guide slope 642' is formed on outer side of the hook section 642.

[0021] The resilient member 66 is disposed between the outer cover 13 and
the first rod body 62. When the first rod body 62 is rotated and the
second rod body 64 is drivingly angularly displaced, the guide slope 642'
of the hook section 642 slides over the column body or cylindrical body
of the first connection section 14. Therefore, the second rod body 64 is
also driven and vertically displaced. The resilient member 66 can be a
wave washer. Two ends of the resilient member 66 respectively abut
against the outer cover 13 and the first rod body 62.

[0022] The fourth connection section 17 is disposed at a second end of the
outer cover 13 corresponding to the second connection section 15 for
connecting with the same.

[0023] The fourth connection section 17 can be a column body or
cylindrical body fixedly disposed on the outer cover 13 for engaging with
the waved plate body of the second connection section 15. Alternatively,
the second connection section 15 can be a C-shaped plate body (not
shown). In this case, the column body or cylindrical body can be also
engaged with the C-shaped plate body.

[0024] According to the above arrangement, after using the circular saw
and when it is necessary to detach the outer cover 13 for maintaining or
servicing the circular saw, a user only needs to rotate the first rod
body 62 to separate the first and second connection sections 14, 16 from
each other. Then the second and fourth connection sections 15, 17 are
separated from each other. After serviced, a user can perform an
operation reverse to the above operation to easily assemble the outer
cover 13 with the main body 12.

[0025] After the outer cover 13 is disassembled, the assembling components
will not detach from the outer cover 13 so that the user can immediately
reassemble the outer cover 13 with the main body 12. Accordingly, the
problem existing in the prior art that the assembling components are
often hard to find is eliminated. Therefore, the user is protected from
holding the circular saw without the outer cover so that the safety can
be ensured.

[0026] Please refer to FIGS. 4 and 5, which show a second embodiment of
the quick-release structure for outer cover of the handheld circular saw
of the present invention. In this embodiment, the through hole 32 of the
outer cover 13 is stepped hole and the resilient member 66 is a coiled
spring.

[0027] The coiled spring is positioned in the through hole 32 of the outer
cover 13. The first rod body 62 is fitted through the coiled spring.

[0028] The hole 641 of the second rod body 64 extends through the second
rod body 64. The first rod body 62 is formed with a threaded hole 623. A
screw 643 is screwed through the hole 641 into the threaded hole 623 of
the first rod body 62 to connect the first and second rod bodies 62, 64.

[0029] The above embodiments are only used to illustrate the present
invention, not intended to limit the scope thereof. Many modifications of
the above embodiments can be made without departing from the spirit of
the present invention.